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An aerosol generator comprises a vessel having first and second chambers in fluid-flow communication with one The first chamber is configured to contain a LVP substance. A heater configured to heat the substance is provided. A first input port is configured to flow a primary gas into the first chamber, thereby to in the second chamber a vapor compound include at least one element of the substance. A second input port is configured to flow a cooler carrier gas into the second chamber, thereby to condense the vapor and form an aerosol therefrom. An output port configured to extract the aerosol from the vessel